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Dark currents of GaAs/AlGaAs quantum-well infrared photodetectors
National Lab for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences.
National Lab for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences.
National Lab for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences.
National Lab for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences.
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2007 (English)In: Applied Physics A: Materials Science & Processing, ISSN 0947-8396, E-ISSN 1432-0630, Vol. 89, no 3, 701-705 p.Article in journal (Refereed) Published
Abstract [en]

We study the dark current of the GaAs/AlGaAs quantum-well infrared photodetector (QWIP) by assuming a drift-diffusion carrier transport in the barriers where the electric fields are obtained by the current continuity condition and the self-consistent energy band structure. It has been shown that due to the current continuity condition, the dark currents across the QWIP devices are determined by the thermionic emission from the emitter to the multiple quantum well (MQW) region. The self-consistent calculation of the Schrodinger and Poisson equations shows a weak electric field in the barrier region connecting to the emitter (much smaller than the average field across the QWIP at low bias) due to the accumulation of carriers in the triangle quantum well formed at the emitter-MQW interface, which results in a very small dark current at low bias. The numerical results explain well our experimental observation.

Place, publisher, year, edition, pages
2007. Vol. 89, no 3, 701-705 p.
Keyword [en]
self-consistent model
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-16967DOI: 10.1007/s00339-007-4142-2ISI: 000249663500020Scopus ID: 2-s2.0-34748889520OAI: oai:DiVA.org:kth-16967DiVA: diva2:335010
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Experimental and theoretical study of quantum dot resonant tunneling diodes for single photon detection
Open this publication in new window or tab >>Experimental and theoretical study of quantum dot resonant tunneling diodes for single photon detection
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Single photon detection has a broad application in the medical, telecommunication, as well as in infrared imaging fields. In this thesis I present my work in studying quantum dot (QD) resonant tunneling diodes (RTD) for single photon detection. The device was processed in the form of a free-standing small-area air bridge. A detailed series of experimental and theoretical characterizations have been performed to understand the electrical properties of the RTDs (without embedding any QDs) and QD-embedded RTDs (QDRTDs). It has been shown that external series and parallel resistances shift the resonant current peak to higher voltage, create the bistability effect observed in I-V characteristics, and reduce the peak-to-valley ratio. For the QDRTD device, three-dimensional wave packet carrier transport simulations show strong influence of the long-range Coulomb potential induced by the hole captured by the embedded InAs QDs, thus demonstrating the fundamental principle of single photon detection.

 

Two works are planned for the continuation of the graduate study after Lic examination. The optical response of the QDRTD will be experimentally and theoretically characterized in order to optimize the quantum efficiency for single photon detection. I will then concentrate on processing a one-dimensional photodetector array aiming at practical biotechnology applications.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 36 p.
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-9342 (URN)978-91-7415-117-6 (ISBN)
Presentation
2008-10-15, FA31, AlabaNova, Roslagsbacken 21, Stockholm, 13:00 (English)
Supervisors
Note
QC 20101111Available from: 2008-10-21 Created: 2008-10-21 Last updated: 2010-11-11Bibliographically approved

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